Platz Isolierte Führung (rot / gelb / weiß)

1.square insulated flexible ventilation ductdurable material made of Aluminium foil+PET+helix steel wire+ red fiberglass+ aluminum foilouterjacket.2.Apply for low /medium / high pressure, use forair ventilation in each environment .3.Round style, and easy to install oval or round connection .4.Fireproofing,at high temperatures or in case of fire ,no toxic gas emitted .5.Easy to delivery .6.Our price is lowest , the quality is perfect , and the deliverywill be prompt .7.Diameter Range : 75-750MM (3"-30")